<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="./jquery-3.5.1.min.js"  defer></script>
    <script src="./层级，子选择，过滤器.js" defer></script>
    <title>Document</title>
</head>
<body>

    <!-- 层级选择器、子选择器、过滤器 -->
    <div class="testing">
        <ul class="lang">
            <li class="lang-javascript">JavaScript</li>
            <li class="lang-python">Python</li>
            <li class="lang-lua">Lua</li>
        </ul>

        <ul class="lang1">
            <li class="lang-javascript">JavaScript</li>
            <li class="lang-python">Python</li>
            <li class="lang-lua">Lua</li>
        </ul>
    </div>

    <!-- 练习文档 -->
    <!-- <div class="test-selector">
        <ul class="test-lang">
            <li class="lang-javascript">JavaScript</li>
            <li class="lang-python">Python</li>
            <li class="lang-lua">Lua</li>
        </ul>
        <ol class="test-lang">
            <li class="lang-swift">Swift</li>
            <li class="lang-java">Java</li>
            <li class="lang-c">C</li>
        </ol>
    </div> -->
    
</body>
</html>